Music-record sheet for automatic piano-playing mechanisms and the like.



A. R. TRIST. HUSIO RECORD SHEET FOB. AUTOMATIC PIANO PLAYING MECHANISMS AND THE LIKE.

I APPLICATION IILED D130. 11. 1907. 941,433. Patented Nov. 30, 1909.

- figures.

of music record sheet.

ing a layer w-of tin foil or conductor attached thereto.

.- foil being arranged UNITED STATES], PATENT. ornron. v

' AR'rHim RONALD rms'rfor sr. ALBANS, ENGLAND, ASSIGNOR TO TRIST PIANO PLAYER LIMITED, or LoNDoN, ENGLAND.

MUSIC-REGORD sHEErroRAUroM-A'rizo rieNo-rtnvrire MECHANISMS AND THE LIKE.

941,433. 3 Original application filed November 10,

Specification of Letters Patent. Patented N m, 1909, 1906; Serial 110.3 1.2391. Divided and this application filed December 11, 1907. Serial No. 406,032.

Sheets for Automatic Piano-Playing Mechanism and the Like, of which the following is. a specification.

This invention relates to music record sheets for automatic piano playing mechanism and the like and has for its object the provision of means on the record sheet whereby the accentuation of specific notes in any composition is effected in a simple Inconnection with each note of electromagnet. or solenoid or other. equiva- ;lent device which is energized by an electric current and is controlled in its action by the music sheet itself.

In order that my invention may be the better understood 1 will now proceed to. describethe same in relation to the accompanying drawing reference being had to the letters marked thereon.

Like letters refer to like parts in both underside plan of my form Fig. 2 is an exaggerated sectional view of the same. v

Referring to Figs. 1 and 2 it will be noticed. that the music record sheet consists of the ordinary perforated tune sheet 20 havother electrical A backing of g] is applied to the tin foilinorder to an exposed strip .2' of tin at the edge of a music record sheet on which the roller bears so as to complete an electric circuit through the record sheet. It-is obvious that the backing layer y may be omitted without interfering with the function of the sheet, it being only necessary for protective purposes from me- Figure 1 is an paper protect the same,

chanical inptry of the tin foil or other me-v tallic layer.

The paper layer w of the record sheet is ordinary perforations obscured by the tinfoil layer 00 which forms .the only means for actuating loud notes which form the melody'and which are to be accentuated. The perforations w right. through the record sheet are at the leading end of the note pcrforationsand permit the air to enter the particular orifice in the tracker so that the said notes (say forming the accompaniment) are struck softly andthe notes on beingstruck are held on by the electric circuit being completed by the tin foil which is exposed by the continuation of the perforations 10 as provided in the ordinary m'usicsheet. It will be thus seen that when a perforation comes over the tracker and the ordinary valves of'the pneumatic action are operated in the usual manner, the duration of the particular note struck by means of the governedvacuum can be controlled either by the length of complete perforation or by the exposed foil in the perforation. In this way any note unperforated can be perforated at will by a person desiring such noteto be softened-in addition to the original perforations provided on the sheet.

where the tin foil only is exposed, occurs the to which are wholly Vhen an unperforated note via: one

electrical circuit is completed, the orifice in the power pneumatic is put into direct communication with the high vacuum of the reservoir thus causing'the power pneumatic to strike a hard or loud note. It will be 'readily understood that the function of the perforated and non-perforated parts of the record sheet together with the correspond-- ing mechanism controlled by same can be re versed viz the hard notes can be produced by the perforated notes and thesoft notes by the tin foil or non-perforated notes.

It is obvious that 7 regulated or controlled by the usual mechanism if thought desirable.

Having now described my inventiomwhat I claim and desire to secure by Letters Pat'- ent is y I A record musi sheet for pneumatic plano playing apparatus having anon-conducting layer perforated with all the note perforathe high vacuum can be tions in combination with a conducting layer In testimony whereof I have signed my aving through perforations for selected name to this specification in the presence of 10 notes arranged at the end of the note perfotwo subscribing Witnesses.

rations of the non-conducting layer-adapted 5 to control the striking of the selected notes ARTHUR RONALD TRIST' in distinction to the other notesinitially 0p- Witnesses: erated by the non-perforated conducting CHARLES CAKTER,

layer. H. D. JAMESON. 

